A valve is a mechanical device used to start, stop, direct, or regulate the flow of fluids within a system.
Industrial valves operate by opening, closing, or partially obstructing a flow path to control fluid movement in response to process conditions such as pressure, temperature, flow, or level.
Common valve types include ball valves, gate valves, globe valves, butterfly valves, check valves, diaphragm valves, and needle valves.